使用plus 获取了已安装应用列表，图标如何转换呀？

var apkKist = []; // 这个是应用列表
plus.android.importClass('java.util.ArrayList');
plus.android.importClass('android.content.pm.PackageInfo');
plus.android.importClass('android.content.pm.PackageManager');
var ApplicationInfo = plus.android.importClass('android.content.pm.ApplicationInfo');
var MainActivity = plus.android.runtimeMainActivity();
var PackageManager = MainActivity.getPackageManager();
var pinfo = plus.android.invoke(PackageManager, 'getInstalledPackages', 0)

            plus.android.importClass('android.graphics.drawable.BitmapDrawable');     
            var BitmapFactory = plus.android.importClass("android.graphics.BitmapFactory");  
            var Base64 = plus.android.importClass("android.util.Base64");  
            var Bitmap = plus.android.importClass('android.graphics.Bitmap');  
            var ByteArrayOutputStream = plus.android.importClass("java.io.ByteArrayOutputStream");  
            if (pinfo != null) {  
                for (var i = 0; i < pinfo.size(); i++) {  
                    //PackageInfo{4b45699f9d  com.tencent.mobileqq}      
                    var pkginfo = pinfo.get(i);  
                    var issysapk = ((pkginfo.plusGetAttribute("applicationInfo").plusGetAttribute("flags") &  
                        ApplicationInfo.FLAG_SYSTEM) != 0) ? true : false  
                    if (issysapk == false) {  
                        const apkinfo = {  
                            name: pkginfo.plusGetAttribute("applicationInfo").loadLabel(PackageManager)  
                                .toString(),  
                            packageName: pkginfo.plusGetAttribute("packageName"),  
                            // versionName: pkginfo.plusGetAttribute("versionName"),  
                            // versionCode: pkginfo.plusGetAttribute("versionCode"),  
                            appIco:pkginfo.plusGetAttribute("applicationInfo").loadIcon(PackageManager)  
                        }  

                        var bimp=apkinfo.appIco.getBitmap();                              
                        try{  
                            var baos = new ByteArrayOutputStream();  
                            bimp.compress(Bitmap.CompressFormat.JPEG, 100, baos);  
                            baos.flush();  
                            baos.close();  
                            var bitmapBytes = baos.toByteArray();  
                            var result = "data:image/jpeg;base64,"+Base64.encodeToString(bitmapBytes, Base64.DEFAULT);  
                            apkinfo.img=result;  
                        }catch(e){  

                        }  
                        apkKist.push(apkinfo);  
                    };  
                };  
            };